How Do I Subtract From Bullet Speed

I want it so that over time my bullets speed decreases and stops at 0. Can anybody help?

Just give the bullet behavior a negative acceleration value, which will slow it to zero over time. Alternatively, set the object's speed(from the bullet behavior) to something like this:

Object.Bullet.Speed - RateOfDeceleration * dt[/code:1obkleai]
The behavior doesn't seem to allow negative speeds, so this more or less stops at 0, though things seem to get wonky when it hits that point, so you may clamp that value between 0 and some absurdly high value.

You can also give a negative value to acceleration